There are many type of keyword tool to be found on the World Wide Web, much to the relief of many online advertisers as well as site owners. These tools, as their names suggest, are free to use and are aimed for those who are on a tight budget. Also these free tools do the same job as the commercial ones.

keywords plays very keen role in SEO. SEO ia all about keywords and keyword ranking. Choosing the best keyword for website is a very analytical process. Google adword is one of the tool which is used in researching keywords.

i am using Google keyword tool always for keyword research but i never any face this type problem that i see different result when i am login and different when i am sign out. so may be you confused with location or keyword match i.e exact or broad keyword suggestion

Well. Google keyword tool is always works after login with gmail account because its will detect geo-graphic location by which google tool can give accurate results.
But If you would like to change the location then you can select the Country > Language >Devices from "Advanced Options and Filters".
Its will sure give you accurate Global Search Volume and local Search Volume (Monthly)
- Even Google keyword tool also gives CPC value which will give you exact value of a keyword.